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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '388c6cdca98e5d57b589b0ed06ee39f623d1018a6a636d77b4f3e78c7bbd205a' 
  AND token = 'DZ5QRhxYwsg7frfD45UyHmuSGNe4cMjyvsYkVbWjb90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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