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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7fb2c4860e99f4524c32aa1d6fda45d609b2f07b8be4bdff0347eabdc0a4ccac' 
  AND token = 'EjaRznm+BVRSLGltkta1uDbb66wEhKYCTNmKdDwYH7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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