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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '11cf2eecee42ff7626bb0df39d79a1f32616771690774b395cf17be29e75dad0' 
  AND token = 'PYckQC4g21em14fG3RDM94YGU2EaiZcZSxwB6DSzb3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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