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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fdf72da1b408286adbac6ec11c272115515e9ad313b94aab780398e3a6e3b262' 
  AND token = 'o8OZw8McpE47xxjYmb1d49hZkCdPlXMorHX2y/s+coM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}