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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3bfccf37672c351871732b1a5713f23826862604947a888e6baa684e4053cfde' 
  AND token = 'Rr2XJfJ6yZjjecIdVovEyBVRGVJHDrIJ1SIlrWBw8tM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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