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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '502408be289c6b5ec0158c88eed714a833b4ccf90bedc2776d8d43d16e67a050' 
  AND token = 'o5LDhJqcnzcBS7x53HOoPxUbB0jS51pbC4bDpmdx8fM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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