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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b701a160092ff6654bcb77d1e3a337c2da12edb7c96d0be3ed643297458a60d' 
  AND token = '25RYb6oXiGnYHKSHS4Y3I9cl3Np2rtRq8mg55VxKPyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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