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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '683b627aad8ce5cca4d5584867b7fc1f4b32c64f6810b28cd6252f9e908e933a' 
  AND token = 'ib9cTBBQqK3lgnrbyXYFIiUQ0d7NxO8FzTFskpaQfPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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