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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '1fc1cd6699c175567b010849c37dbb24ecd6da56aac1ef5260b1020d4c41f587' 
  AND token = 'F737Xlv5mwPINi/3crU03MeUPA5MZrO5fBoNYbUfJRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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