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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '401bfc9fa0eb328b80dd35aed87d06f3521be7555ff5c7a6cbe805a5e932e1e0' 
  AND token = '2TWy+qdjtncUJJZdmjmT1mUIODxUtke78JRJaNzlJuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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