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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cb9db983199c40a5e0d0a5cd2c6d98f1ab90b983f07d846bb6cdc3d7fd36923b' 
  AND token = 'mSrIY9iu46iZ9Uyv7PFekMtlb004Sjdb8RVOE4Rd0Xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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