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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd05cc6d0f85c46def63ba77a5103d77bb1c195dbd6d46c11013d2db586c71d1f' 
  AND token = 'nhkAFGYgVuMryJY0Az807zmuSpgcUdfF8zAtV5AWsQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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