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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7944b4d3aee3f619de94268bc0c0c6ae628ebd286357baff3a3423f34f15920b' 
  AND token = '0B42coI7skRFTEcCL3TwMdFRGH0S0wafHkfQ1dWsXHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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