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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ab9bcbca5fe664657ab78710999091a2857b2b96568835c6481a88e7744acccc' 
  AND token = 'MDOT1uXqvA4TMI/MTBcnUR5ad4gsbgmHiWbnXx7SEmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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