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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5491c4b9ae4053a1a4ed6a0a8560af83f9a2d4573fbcf9ffcde5aa90ffcbe060' 
  AND token = 's175RzizZ0DR9x961b2N2iw10PZ8axIYmgRIk1zFdrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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