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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '053906663283795c7495a3714d6247c311282fbd071927b5db2d7369ef690bec' 
  AND token = '3kAyDUTcdnvNwmgSF8ZiSElEKa9ppIE3jquQA81z0s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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